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been done. The fourth reconmcndatioil was that one, drive point <br /> b <br /> bell be placed directly under the point of contamination ( the pit <br /> hat <br /> Jltime? to determine possible impact on <br /> as such srnaer at t <br /> ground water . This objective has been aequeent sbm IJin dand' r'anaf <br /> the excavation to -45' g. l . and the subs <br /> P 6 <br /> ile CNof both bottom soil and groundwater influx into the exca- <br /> lyzing <br /> vation. <br /> The GTI repoter <br /> rt Indicated a southeasterly directioOf olro�ed+renal <br /> The <br /> Figure i , the San aoaquin County Flood g <br /> ++ater level map, spring of lyS9, sho.vs a Southerly direction of <br /> the GTI measurements . <br /> flow, which is in general accordance with <br /> detect contamination <br /> NMI-2 is currently located in a position to <br /> from either southerly or southwesterly HO ver, theeagroundn'ateuthsterly +r <br /> plume could possibly miss this well ; <br /> age should have indicated such if it . had <br /> tested from pit seep <br /> occurred. <br /> by <br /> D in <br /> A need for two additional moitorA Si+;eone ofswhich ecbS � <br /> ouldbepre- <br /> their letter of 8/2/88 (Appendix <br /> groundwater in this <br /> cIudeu by "removing contaminated soil to g discussed <br /> area." She contaminated soil has been rem gpvedoagnam"�arried out , <br /> earlier , an extensive soil and +ater test; n <br /> ne should be adequate <br /> as directed by the DHS. The level of work do <br /> to preclude a need for any more monitoring +yells • <br /> RECO.N-JE,NDAT ION <br /> A quarterly water sa=mpling and testing program is recorrmended for <br /> il such time that the DHand <br /> the current monitoring wells untcontamination exxists. <br /> C1'RwQCB are satisfied that no groundwater co <br /> These wells , although not ideally placed to detect a southeast- <br /> erly plume of contamination, are in place and should be restored <br /> to usable condition. <br /> Proceed with a program for soil remed�atiort and/or disposathe <br /> g the falling- in of the excavation and king <br /> ultimate goal bein <br /> possib'.e a higher use of the land . <br /> Program <br /> :rthe- <br /> 1 , Repair the monitoring well 'heads SR uddanga�dtansaoniCeo for <br /> 2" plasTic well pipe, including P <br /> locking. The +�'elJs should extend above the ground and be <br /> plainly visible so as to preclude shearing them again during <br /> ren-tedlatior.. <br /> � c.ar.-elu1.l...} meas- <br /> 2 . Revise the surveyed �t`eJl heads'eleyat-r.ans -{ the new, <br /> uncapped <br /> uring from the surveyed ?Dint o .he top a. <br /> well top• <br /> wel ! s by air purging and air lifting .when water is <br /> 3. Clean all <br /> 14 <br />